Algae id request

[Llg]

I have had the tank going for over 5 months, but recently upgraded to a larger tank and appear to be battling through the ugly stage. I have some GHA and bryopsis, but the CUC has been doing well with it with some manual removal. I have had cyano for the last two weeks, but in this last week have been battling this really long stranded algae or maybe cyano. I can blow it off the rocks in the morning and by afternoon it is covering everything (including my montis and birdsnest).

I notice that some of these stands attach to the glass and have this white circle from which the strand grows. It will grow inches in the matter of an afternoon.

I have been using microbacter 7 and clean and started a skimmer 3 weeks ago to bring down nitrates. I also have chaeto and after dosing a bit too much vibrant one night, just now have the chaeto stable again.

I don't want to take the chaeto out, but really need this to go before it kills corals. Any suggestions on what this is? I don't think it is dinos. My tank has never been at 0 for nitrates and P. I have always had some bubbles from algae on the new rocks as they were dry rocks and the coralline is growing.

Nitrates 2.5-5
P .1 (I want to add some phosguard to lower for my SPS but not until this is under control)
Ph 8.2
Alk 8.9-9.3
Ca 480
Mg 1410
Salinity 1.026

 

[GillMeister]

Hard to say with these images but your description might be dinos?

 

[Llg]

They don't disappear overnight like dinos do.

 

[Llg]

Hard to say with these images but your description might be dinos?

I did run thr peroxide test tonight and it does bubble, so that would say cyano, but it just is growing so fast